rel_erl is a lightweight relational in-memorydatabase for Erlang.
Features
1. Data rows are stored in the process dictionary.
2. Unique and referencial constraints are enforced.
3. There can be more than one index per table.
4. One-to-many joins are fast and easy.
Mosquito is an open source Java library for parsing Power Designer PDM files and converting them to the in-memory structure based on object model provided by this library. It is quite useful for relational model based code generation.
StormFactory is a light, streamlined ORM code generator for C#/SQL Server apps. The project's aim is minimize the learning curve, maintain a tiny memory footprint, and to generate extremely portable, scalable, easily maintained and dependency-free code.